求翻译：他实际上是数的指数计数法在计算机中的具体体现，解决了定点表示中取值范围过窄的问题。浮点表示中，数由两部分构成，一是阶码部分，二是尾数部分。都是对数值数据的表示。是什么意思？

He is actually a number of concrete manifestation of exponential notation in computer addresses narrow the range of fixed-point representation problems. In the floating point representation, a two-part number, part of first-order codes, part II is the tail number. Are representations of numerical data.